کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1237351 | 968890 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ortho effects on the change in electronic absorption spectrum of pyridinium salts of saturated bromohydrocarbon
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ortho effects on the change in electronic absorption spectrum of pyridinium salts of saturated bromohydrocarbon Ortho effects on the change in electronic absorption spectrum of pyridinium salts of saturated bromohydrocarbon](/preview/png/1237351.png)
چکیده انگلیسی
The quaterisation process of 1,2-dibromoethane and pyridine is in situ traced by electronic absorption spectrum. Two absorption peaks, induced by mono- and bis-pyridinium salt of 1,2-dibromoethane, appear at 429 nm and 313 nm, respectively. To explain the phenomena, several kinds of alkyl bromides with special structures were selected and compared by experimental measurement and theoretical calculation. The results indicate that for mono-pyridinium salt of 1,2-dibromoethane, the electron donor property of ortho-bromine group increases the electron cloud density of the carbon atom associated with pyridinium cation, which induces red-shift of absorption wavelength.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 74, Issue 5, December 2009, Pages 1084–1089
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 74, Issue 5, December 2009, Pages 1084–1089
نویسندگان
Jin-Ling Song, Li-Ming Gong, Shou-Ai Feng, Jiang-Hong Zhao, Jian-Feng Zheng, Zhen-Ping Zhu,